The positives:
1) They connected easily to the computer's bluetooth. They only came with a usb cable, if there is no bluetooth then they can also work wired. But in the package I received, there was no bluetooth adapter, fortunately, I didn't need it.
2) I was honestly impressed by the sound, it seemed quite good to me.
3) They are quite lightweight.
4) The battery life is decent.

The negatives:
1) They do not expand/open much resulting in not fitting well on my head. It's the first time I get headphones that imply I have a big head.
2) And the most important of all: the mute. Well, there are 2 ways to mute. One is to press the volume down for 2 seconds. It's not practical. Moving on. The second way is to lift the microphone up. Here lies the problem. As you move the microphone, it makes a very strange sound, which is also heard by the interlocutor! Also, there is a central button on one earphone. There is no way, maybe through jabra software, to change its function to be for example for Mute.
3) I have used them a few times to watch a movie, and regularly the sound would cut out, as if losing signal.

That's it. They have problems that are not justified by their very high price. Try something else.